Substitution effects of p-block elements on magnetic properties of GdNi4B, GdNi4In, GdCo4Al and DyCo4.6Si0.4

The polycrystalline CeCo4B-type GdNi4B (space group P6/mmm, N 191, hP12), CaCu5-type GdCo4Al and DyCo4.6Si0.4 (space group P6/mmm, N 191, hP6) and MgCu4Sn-type GdNi4In (space group F-43m, N 216, cF24) were prepared by arc melting with following annealing. The magnetic ordering and magnetocaloric effects of these compounds have been investigated using magnetic measurements in fields up to 90 kOe. GdNi4B and GdNi4In show dominant ferromagnetic ordering of Gd sublattice with TC of 39 K and 24 K, respectively with magnetic entropy change of -11.3 J/kg & sdot;K for GdNi4B and -11.8 J/kg & sdot;K for GdNi4In for a field change of 50 kOe. GdCo4Al and DyCo4.6Si0.4 exhibit high-temperature dominant ferromagnetic ordering of Co sublattice with lowtemperature spin-reorientation transformation of magnetic ordering and dominant ordering of rare earth sublattice in width temperature interval. In a field change of 50 kOe, the compensation temperature of DyCo4.6Si0.4 is followed via table -like magnetic entropy change of -1.0 J/kg & sdot;K at -40-240 K, while GdCo4Al exhibits magnetic entropy change of around -0.6 J/kg & sdot;K at -150-300 K.